Although fibronectin is a structural molecule expressed by osteoblasts, pericytes and endothelial cells in bone marrow (25), with many functions in hematopoiesis such as migration, homing (26), retention (27), differentiation, and cell proliferation (28), it was not detected by immunofluorescence both in peripheral zone of the granulomas and among the hematopoietic cells around large vessels. Here, FN1 is linked to Granuloma.